YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1947 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1948 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1949 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1950 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1951 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1952 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1953 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1954 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1955 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1956 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1957 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1958 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1959 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1960 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1961 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1962 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1963 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1964 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1965 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1966 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1967 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1968 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1969 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1970 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1971 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1972 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1973 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1974 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1975 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1976 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1977 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1978 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1979 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1980 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1981 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1982 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1983 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1984 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1985 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z |
1986 | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 55.36 | s | 44.52 | 30.47 | 26.23 | a | 33.74 | i | ||
1987 | 21.58 | 29.40 | c | 28.87 | 37.07 | 52.42 | 59.97 | a | 63.10 | 61.81 | 54.23 | 42.61 | 30.62 | a | 21.65 | 41.94 | ||||||||||
1988 | 19.65 | 23.39 | a | 27.32 | 37.80 | 48.93 | a | 58.86 | a | 63.00 | 62.90 | 53.67 | 43.16 | 29.83 | 21.77 | 40.86 | ||||||||||
1989 | 23.42 | 22.71 | 31.29 | 43.03 | 52.90 | 57.97 | a | 61.84 | 62.17 | a | 51.60 | 41.35 | 27.63 | 16.93 | a | 41.07 | ||||||||||
1990 | 22.61 | 24.74 | a | 33.52 | 42.33 | 48.65 | 62.20 | 61.55 | 60.39 | 56.67 | 40.55 | 33.03 | a | 17.73 | a | 42.00 | ||||||||||
1991 | 21.70 | a | 26.15 | a | 31.94 | 40.45 | a | 52.52 | 60.60 | 61.81 | 61.97 | 53.97 | 42.29 | 28.20 | 27.90 | a | 42.46 | |||||||||
1992 | 24.74 | 30.15 | b | 32.90 | 43.34 | a | 50.77 | a | 57.37 | 61.90 | 60.13 | 53.41 | a | 40.63 | a | 27.48 | a | 24.40 | a | 42.27 | ||||||
1993 | 23.42 | 23.07 | 30.86 | b | 39.17 | 49.61 | 59.67 | 65.71 | 61.32 | 50.97 | 39.74 | 26.23 | 22.45 | 41.02 | ||||||||||||
1994 | 20.80 | a | 20.07 | 33.58 | 38.73 | 52.19 | 62.20 | 62.55 | 60.27 | a | 53.43 | 42.84 | 33.10 | 27.13 | 42.24 | |||||||||||
1995 | 24.65 | 27.04 | 32.29 | 38.63 | 48.77 | 58.21 | a | 61.52 | 62.57 | a | 54.87 | 40.52 | 31.17 | a | 25.00 | 42.10 | ||||||||||
1996 | 18.32 | 25.59 | 26.74 | 37.90 | 54.48 | 55.90 | 63.81 | 62.03 | 53.43 | 41.87 | 31.17 | 22.19 | 41.12 | |||||||||||||
1997 | 21.06 | 25.86 | 31.10 | 36.60 | 50.13 | 57.80 | 62.87 | 61.21 | b | 56.17 | a | 42.13 | a | 29.40 | 23.19 | 41.46 | ||||||||||
1998 | 24.26 | 29.36 | 29.06 | 38.07 | 53.03 | a | 58.73 | 65.07 | a | 61.23 | 58.07 | 47.52 | 35.10 | a | 24.52 | 43.67 | ||||||||||
1999 | 24.59 | b | 27.93 | 32.74 | 40.40 | 49.57 | a | 60.27 | 64.26 | 63.33 | a | 53.69 | a | 40.42 | 32.53 | 24.10 | b | 42.82 | ||||||||
2000 | 23.03 | 27.45 | 33.33 | a | 40.77 | 53.79 | b | 61.30 | 63.52 | 61.63 | a | 53.54 | b | 46.83 | a | 27.86 | b | 19.07 | a | 42.68 | ||||||
2001 | 22.33 | a | 27.33 | a | 32.03 | a | 42.46 | b | 52.10 | a | 60.41 | a | 65.35 | 62.57 | a | 54.17 | 39.93 | a | 37.00 | b | 23.35 | 43.25 | ||||
2002 | 22.13 | a | 22.37 | a | 26.93 | b | 43.86 | a | 49.61 | 61.87 | 63.42 | 63.45 | 53.80 | 43.81 | 31.03 | 24.53 | a | 42.24 | ||||||||
2003 | 22.70 | a | 22.57 | 32.03 | a | 40.27 | 49.87 | 58.67 | 63.58 | 63.32 | 53.03 | 45.52 | 32.57 | 21.45 | 42.13 | |||||||||||
2004 | 23.74 | 23.34 | 39.23 | a | 42.40 | 52.48 | 60.14 | a | 62.29 | 60.45 | 53.97 | 44.87 | a | 33.90 | 22.61 | 43.29 | ||||||||||
2005 | 27.10 | 29.43 | 30.42 | 39.23 | 51.19 | 60.50 | 62.00 | 62.00 | 57.10 | 44.23 | 29.20 | 21.10 | 42.79 | |||||||||||||
2006 | 23.55 | 21.48 | a | 32.35 | 42.93 | a | 53.87 | 61.43 | 64.55 | 64.52 | 52.24 | a | 44.03 | 32.33 | 23.00 | 43.02 | ||||||||||
2007 | 20.65 | 23.82 | 37.90 | 37.67 | 52.20 | a | 58.73 | 62.00 | 64.03 | 58.23 | 43.77 | 30.62 | a | 24.55 | 42.85 | |||||||||||
2008 | 19.37 | a | 23.76 | 30.00 | 37.37 | 49.97 | 60.57 | 62.10 | 60.52 | 51.77 | 41.23 | 28.93 | 21.58 | 40.60 | ||||||||||||
2009 | 18.03 | 25.07 | 31.48 | 37.63 | 50.42 | 60.10 | 62.55 | 61.07 | a | 52.20 | 39.52 | 30.77 | 18.55 | 40.62 | ||||||||||||
2010 | 19.68 | 23.21 | 29.84 | 40.97 | 50.26 | 63.37 | 63.97 | 62.32 | 57.63 | 43.32 | 28.43 | 25.32 | 42.36 | |||||||||||||
2011 | 16.68 | 17.75 | 33.13 | 40.20 | 46.48 | 62.57 | 66.10 | 65.58 | 53.83 | 42.19 | 29.97 | 25.13 | 41.63 | |||||||||||||
2012 | 21.87 | 25.72 | 36.61 | 44.83 | 52.81 | 62.60 | 64.03 | 62.16 | 54.03 | 40.23 | 33.57 | 24.16 | 43.55 | |||||||||||||
2013 | 23.81 | 23.71 | 32.94 | 34.00 | 47.55 | 61.23 | 61.74 | 61.26 | 55.63 | 38.84 | 27.37 | 19.74 | 40.65 | |||||||||||||
2014 | 15.32 | 20.82 | 25.03 | 36.33 | 46.68 | 59.93 | 61.94 | 60.26 | 58.13 | 43.35 | 25.70 | 25.48 | 39.92 | |||||||||||||
2015 | 21.10 | 23.07 | 29.39 | 38.40 | 48.35 | 60.73 | 63.19 | 60.81 | 57.50 | 46.74 | 30.07 | 25.06 | 42.03 | |||||||||||||
2016 | 21.87 | 23.79 | 33.58 | 39.53 | 47.71 | 60.30 | 63.45 | 60.52 | 56.43 | 44.61 | 34.67 | 21.26 | 42.31 | |||||||||||||
2017 | 23.71 | 27.29 | 33.55 | 41.90 | 46.13 | 59.67 | 62.68 | 60.61 | 53.97 | 42.77 | 33.23 | 21.48 | 42.25 | |||||||||||||
2018 | 15.52 | 22.82 | 31.55 | 35.03 | 54.03 | 61.27 | 63.26 | 60.74 | 55.27 | 44.23 | 26.53 | 22.39 | 41.05 | |||||||||||||
2019 | 20.94 | 22.14 | 29.16 | 38.23 | 48.10 | 57.00 | 61.94 | 63.58 | 60.03 | 37.87 | 26.50 | 25.48 | 40.91 | |||||||||||||
2020 | 23.13 | 21.45 | 35.61 | 36.13 | 49.16 | 59.43 | 64.42 | 61.68 | 49.37 | 38.06 | 33.57 | 20.35 | 41.03 | |||||||||||||
2021 | 21.74 | 16.46 | 29.87 | 37.13 | 50.19 | 60.60 | 62.77 | 61.90 | 55.47 | 42.97 | 30.10 | 27.03 | 41.35 | |||||||||||||
2022 | 15.35 | 14.75 | 26.29 | 37.77 | 48.42 | 61.30 | 65.32 | 62.39 | 56.43 | 44.00 | 28.37 | 22.23 | 40.22 | |||||||||||||
2023 | 22.77 | 22.86 | 29.16 | 34.77 | 50.77 | 58.77 | 63.55 | 64.03 | 57.30 | 43.61 | 31.33 | 26.32 | 42.10 | |||||||||||||
2024 | 19.00 | 26.76 | 31.68 | 40.44 | e | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | ----- | z | 29.47 | h | |||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 21.47 | 24.07 | 31.46 | 39.31 | 50.44 | 60.06 | 63.21 | 61.97 | 54.74 | 42.54 | 30.52 | 23.06 | 41.89 | |||||||||||||
S.D. | 2.77 | 3.46 | 3.04 | 2.67 | 2.26 | 1.68 | 1.25 | 1.34 | 2.33 | 2.35 | 2.72 | 2.64 | 0.96 | |||||||||||||
SKEW | -0.67 | -0.50 | 0.25 | 0.14 | -0.02 | -0.32 | 0.59 | 0.68 | 0.11 | -0.01 | 0.21 | -0.36 | -0.10 | |||||||||||||
MAX | 27.10 | 30.15 | 39.23 | 44.83 | 54.48 | 63.37 | 66.10 | 65.58 | 60.03 | 47.52 | 37.00 | 27.90 | 43.67 | |||||||||||||
MIN | 15.32 | 14.75 | 25.03 | 34.00 | 46.13 | 55.90 | 61.52 | 60.13 | 49.37 | 37.87 | 25.70 | 16.93 | 39.92 | |||||||||||||
YRS | 38 | 38 | 38 | 38 | 37 | 37 | 37 | 37 | 37 | 38 | 38 | 38 | 37 |